Expansive and contractive pulley.



88,586. PATENTED MAY 2, 1 905.

' H. A, MANN.

EXPANSIVE AND CONTRAOTIVEI PULLEY.

APPLIOATION FILED FEB. 10. 1904.

lumilllg NITED STATES Patented May 2, 1905.

HENRY A. MANN, OF BOYNE, MICHIGAN, ASSIGNOR OF ONE-HALF TO ERVAN A.RUEGSEGGER, OF BOYNE, MICHIGAN.

EXPANSIVE AND CONTRACTIVE PULLEY.

SPECIFICATION forming part of Letters Patent No. 788,586, dated May 2,1905.

Application filed February 10, 1904- Serial No, 193,026.

To all whom, it may concern:

Be it known that I, HENRY A. MANN, a citizen of the United States,residing at Hoyne, in the county of Oharlevoix and State of Michigan,haveinvented a new and useful Expansive and Oontractive Pulley or BandWheel, of which the following is a specification.

My invention relates to an improvement in pulley or band wheels; and theobjects of my improvement are, first, a wheel the diameter andcircumference of which may be increased or diminished at will and at thesame time retain a continuous and perfect rim; second, a wheel thecorresponding parts of which are interchangeable, and, third, to attainthe above objects and retain the advantages 0 the Wellknown splitpulley. I attain these objects by the mechanism illustrated in theaccompanying drawings, in which Figure 1 is a view of the Wheel with thedifferent parts assembled in place, including a sectional view of one ofthe spokes A. Fig. 2 is a view of a IF-shaped outer spoke detached. Fig.3 is a view, imperfect, of a socket-nut 0.

Similar letters refer to similar parts in the different views.

The different parts are the hub proper, a, hub-spokes 6, workingsocket-nut c, T-shaped outer spoke (Z, and sectional slotted rim 0,together with suitable bolts and set-screws, as set forth in theillustration. Each sectional hub rt and its hub-spokes 7) are integralpieces; but the hub-spokes are hollow from the outer end nearly to theshaft-hole in the hub. Inside the holl'ow hub-spoke 7) is set thesocketnut c, which rests against the shoulder f and is retained andfastened by set-screws g g, which set in thegroove /L, which runs aroundthe nut 0. This nut c is cylindrical in form except where it projectsout from the hubspoke 7). This projection is squared for the purpose ofturning. The outer spoke (Z is threaded 011 its inner end and works inthe socket-nut 0. The cross portion of outer spoke (Z is perforated forbolts or rivets, by means of which it may be securely fastened to themm.

The sectional slotted rim. 0 is of flexible metal suitably curved andtapered at one end, where it laps over the next section. The tapered endof the sectional rim 0 has bolt-holes at J ,bored for countersunkheads,and the other end or under lap of the section has longitudinalslots t', through which bolts having threads and nuts from the outer lapextend, allowing the lap of the sectional rim to increase or diminish asits circumference is respectively diminished or increased. Thesesectional rims 0 also have holes 7, whereby the rim is securely fastenedto the cross portion of the outer spoke (Z.

To change the diameter of the wheel, simply loosen the rim-bolts J andthe set-screws g and turn the socket-nut c to lengthen or shorten thespokes, as desired, and again tighten the set-screws g and rim-bolts J.

The hub of this Wheel is divided and fitted with proper bolts and nuts,as is usual with split pulleys. 1 do not, therefore, claim thisparticular as my improvement; but

What I do claim as my invention, and desire to secure by Letters Patent,is

An expansible pulley having extensible spokes, and comprising a hubhaving hollow spoke portions with shoulders thereon, a socket-nut ineach spoke portion resting on the shoulder, said nut being provided witha peripheral groove, set-screws engaging said groove, a T-shaped outerspoke portion having threaded engagement with each socketnut,rim-sections having tapered overlapping ends, the outer lap portionbeing perforated for bolts having countersunk heads, and the under lapportion being slotted, and bolts therefor.

. In testimony whereof I have signed my name to this specification inthe presence of two subscribing witnesses.

HENRY A. MANN.

In presence of- GEORGE H. JACKSON, WM. L. MARTIN.

